First preparations for Django >= 4.x

- Slight reformatting in some parts; Non-functional changes
- ugettext(_lazy) no longer available in Django > 4, changing to
  gettext(_lazy)
- Since django-openid-auth doesn't work with Django > 4 yet, we need to
  pin this project to Django < 4 until that issue is solved

ivatar/views.py

@@ -13,7 +13,7 @@ from django.http import HttpResponse, HttpResponseRedirect
 from django.http import HttpResponseNotFound, JsonResponse
 from django.core.exceptions import ObjectDoesNotExist
 from django.core.cache import cache, caches
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django.urls import reverse_lazy
 from django.db.models import Q
 from django.contrib.auth.models import User